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Which risk increases when a catalyst's surface area decreases?

A)Reaction rate becomes mass-transport-limited
B)Product selectivity shifts towards undesired products
C)Catalyst undergoes irreversible thermal deactivation
D)Active metal leaching increases diffusion resistance

💡 Explanation

Mass-transport limitations increase when surface area drops, because the overall reaction rate becomes limited by the diffusion rate of reactants via the active site. Therefore, the reaction flux diminishes, rather than active metal loss or selectivity change, because those are kinetically influenced alone.

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